Will try.
The price you purchase something for is what you actually hand over., the price of a box of cornflakes could be £150, that is not the cost
The cost of software is calculated from what it will do for you, and how much. Example.
a Cheep softeware could cost £100, The programmers hourly rate is £20 and the machine hourly rate is £30

a single job could take 4 hours to program and 6 to cut on the machine ir would cost = £80 + £180 = £260
If WorkNC being more efficient could do the same job in 2 hours to program and 3 hours to machine then it would cost £40 + £90 = £130
Therefore he cost of this part with the cheep software could be £260, or the cost of the same part with WorkNC could be £130

Which cost is better to you.

Then you calculate all the jobs you need to do in a day, week , month year and compare the cost of manufacture
I have a calculator you can download from my web page.